Erv Brochure

ERV

Integral Seat, Four-Year Zero Leakage Guarantee

Electronic Relief ValveANSI 150-4500

The Valvtechnologies Electronic Relief Valve (ERV™) is the answer

to the need for a zero- leakage, pilot-operated relief valve. The ERV

package combines Valvtechnologies’ zero-leakage isolation

valve with electronic controls to monitor and

regulate system pressure. Whether in a capacity-

relieving function requiring the ASME V-stamp, or

simply in an overpressure protection application, the

Valvtechnologies ERV™ provides reliable protection for standard

safety valves in many industries. Valvtechnologies can also provide an

integral isolation valve, eliminating the need for costly field welding.


ERVValvtechnologies’ Electronic Relief Valves

• Protect safety valves on boilers• Maintain balance of boiler operations at peak loads• Maintain uniform line pressures• Balance boiler operations during off peak loading

(sliding pressure controls)

FEATURES• ZERO leakage guarantee• Repeatable tight shut-off• Accurate to 1/10% of 1 psi• High precision reliability • Low maintenance requirements• Accurate blow downs = major cost savings• Seat out of flow path when open• Easily adapted to existing controls• Various standard control packages• Integral isolation valves available Integral Seat Detail

ERV


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43

ITEM

6789

1110

121314

5

2122

20

1617

1918

15

STEM

BALL

BODYEND CAP

GLAND

DRIVE SLEEVEMOUNTING PLATEGLAND PACKING

BODY GASKET

GLAND STUDGLAND NUT

BELLVILLE SPRINGUPSTREAM SEAT

DESCRIPTION

KEYBODY NUT

COOLING TOWERDIAPHRAGM

ERV VLV ACTUATORPRESSURE SYPHON

BODY STUD

PRESSURE TRANSDUCER

GLAND LOAD SPRING

* Recommended Spare Parts

INC 718

MATERIAL

10184130

304 SS

A182-F2217-4/P24

QTY.

11*1*1*

1*4416

113*1*1

1

410/RAM31A182-F22/HF

A638 Gr. 660/HFA182-F22/HF

A194 Gr. B8MA193 Gr. B8M

A182-F22/RAM31

GRAFOIL/316 S.S.

1018

1128

111

A194 Gr. B8M

A335 P22

A193 Gr. B8M 8

WIKA MODEL# 990.14WIKA MODEL# 910.24

WIKA MODEL# 891.23.510Hi SPEED ELECTRIC ACTUATOR

PARTS LIST

LIGHTS

SWITCHES

CLOSE

CLOSE

SWITCHAUTO/MAN

ERV CONTROL BOX

OPEN

OPEN

20

18

21

22

PRESSURETRANSDUCERSYSTEM

FLO

WU

P A

S IN

STA

LLED

OTHER PATENTS PENDINGPATENT No. 4.972.872

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14 13

4

11

17

6

78

5

9

1516

12

3

10

12

The patented Valvtechnologies’ Electronic Relief Valve(ERV) is designed to exhaust to the atmosphere or into a closed

system (superheater bypass) and provide total flexibility with both

manual and automatic pressure relief of a pressurized system.

Seating faces are protected with a chrome-carbide hardcoating

with a Rockwell C of approximately 70. Over-pressurization protection

is readily controlled either automatically or manually from the

control room or the local control station. The ERV is available with

complete controls or can utilize existing controls.

ERV“E” SERIESSet Points – The set points of the "E" series ERV are ± 1/10% uncalibrated. This accuracy results in less steam lossduring a blow and better protection of the drum and superheat conventional safety valves.

Safety – The take off point for the signal will typically be from the drum or superheater. This live steam point mustthen be cooled to prevent overheating of the pressure transmitter. To ensure safe maintenance andoperations we have designed a system which consists of a coiled P22 piped siphon which is then welded to a Moneldiaphragm seal. The outlet of the Monel diaphragm seal is then connected to the miniature cooling tower and thepiezoresistive transmitter. As the diaphragm seal is a pressure boundary the transmitter may be removed from thedeal without breaking into the pressure boundary.

Diffuser Outlet – The diffuser outlet minimizes noise and maximizes flow. The face to face dimensions of the "ESeries" is designed with a diffuser outlet and will also be the same design as the conventional straight throughsolenoid operated relief valves being replaced.

Controls – The standard control unit in addition to lights, push buttons and selector switch will also have a programmablecontroller to allow easy adjustments of blow-down and the set points include a local pressure indication display.

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FLOW UP AS INSTALLED


1ISO VALVE20


BILL OF MATERIALITEM DESCRIPTION MATERIAL QTY.

2*2*2*2248882*22*6*4

2

1GEARA194 Gr. 8MA193 Gr. B8M

4130

1018316 S.S./GRAFOIL

17-4A182-F22

A182-F22/RAM31A193 Gr. B8MA194 Gr. 8M

304 S.S.A182-F22/H.F.A638-660/H.F.

Inc. 718A182-F22/H.F.

410 S.S./RAM31BALLUPSTREAM SEATBELLVILLE SPRING

STEMGLAND

GLAND LOAD SPRINGGLAND NUTGLAND STUD

END CAPBODY

BODY SEALGLAND PACKING

KEY

DRIVE SLEEVE

BODY STUDBODY NUT

ISO VALVE OPERATOR19181716151413121110987654321

MOUNTING BARCKET 1018 2

ERV VALVE ACTUATOR PNEUMATIC 1

ERV


“R” SERIESThe "R" Series ERV features a high temperature, double acting rack and pinion

operator piped with a solenoid, beacon indicator, limit switches and a terminal

box for the wiring connection in the control room.

The "R" Series ERV features: • ±1/4% pressure switch that customer connects to a pressure sensing

line. The line would need to have an isolation device • High temperature pneumatic actuator with solenoids and limit switch

that contains relevant terminals • RAM® 31 hardcoating (chrome carbide) on ball and seat • Terminal box for connections from control room • Optional siphon and pressure switch • Optional control box

PORV CONTROL BOX

SWITCHAUTO/MAN

SWITCHES

CLOSEOPEN

CLOSEOPEN

LIGHTS

PRESSURE SWITCH

FLOW

12

10

14

LIMITSWITCH19


BILL OF MATERIALITEM DESCRIPTION MATERIAL QTY.

1*1*1*11

24441*113*4

1

A194 Gr. B8MA193 Gr. B8M

4130

1018316 S.S./GRAFOIL

17-4A182-F22

A182-F22/RAM31A193 Gr. B8MA194 Gr. B8M

304 S.S.316 S.S./H.F.

A638-660/H.F.Inc. 718

410 S.S./H.F.410 S.S./RAM31BALL

UPSTREAM SEATBELLVILLE SPRING

STEMGLAND

GLAND LOAD SPRINGGLAND NUTGLAND STUD

END CAPBODY

BODY GASKETGLAND PACKING

KEY

DRIVE SLEEVE

BODY STUDBODY NUT18

1716151413121110987654321

MOUNTING BARCKET 1018 1

ACTUATOR PNEUMATIC 1

19

11

16

2 13

4567

9

138

17

18

15

Benefits of Valvtechnologies’ERV Controls

• Full pressure protection

• Easily adjusted high and low set points

• Secondary pressure signals can be taken from the boiler nozzle or any other source – customer’s choice

• Multiple signals can be prioritized

• Local NEMA IV control box has programmable controller, relays, 4-20ma signal, local/remote selection switch, open and close push buttons (which only work when selector switch is seton manual) and position indicator lights

• The 4-20ma signal from the pressure transducer that is sent to the local controller can also be used in the control room or plugged into the central control computer.

• The Valvtechnologies’ standard controlscan be adapted to customer requirements,including sliding controls and redundantpressure controls. Overrides can be provided from the control room and local control box.

• DCS signal interfaces are available asare dry and wet contacts.

• Accurate control and repeatable tightshut-off

ERV


Modulating (Sliding) Control Valve & Controller, Positioner, SolenoidNew plants are designed in a way that the superheater vent system is capable of passing larger than normal capacities.

In addition, this particular valve can serve as a pressure control function to prevent the superheater safety valves from

lifting. However, during a normal small pressure excursion this valve will cycle quickly to the open position. The flow

can be large enough to unbalance and trip the system.

The modulating control system eliminates this problem. Assuming the valve needs to be fully open to 105% of normal

expecting pressure. The valve can be programmed to discharge at a range of capacity from 104% to 105%. An example

is if the valve had a total discharge capacity of 500,000 lbs./hr. then at 104%. The valve would be open partially to flow

at 100,000 lbs./hr. (example). If this upset continues and the pressure continues to increase, then at 104.3% the valve

would discharge at 200,000 lbs./hr. (example). At 104.6 the flow would be 300,000 lbs./hr. and at 105% the valve would

fully open to discharge the full capacity of 500,000 lbs./hr.

ASME B31.1

ERV


FLOW

Stacked Disc Option for Controlling Applications– Sliding Pressure Control

From simple minimum to normal flow control to full range-ability over

any range of pressure drops and conditions; Valvtechnologies has the

solution for you.

Upstream pressure reducing plates are stacked so maximum flow (pressure)

travels through the first plate and then splits and pressure continues to

be reduced as flow proceeds to follow tortuous 90˚ paths through

succeeding holes in various stacked pressure reducing plates.

Multi-stage pressure reducing plates are positioned that the diverging

streams through the various plates actually collide with each other. This

greatly reduces their energy before entering the next plate. Pressure reduction is at the upstream side of the

valve, thus reducing the torque required to open and close the valve. The downstream sealing face is pro-

tected from flow and offers repeatable tight shut-off.

5904 Bingle Road • Houston, Texas 77092 • Telephone: (713) 860-0400 • Facsimile: (713) 860-0499E-mail: [email protected] • Internet: www.valv.com

ERVStandard Electronic Relief

Package

• Valve• Actuator Options:

AirSpringHydraulicD.C. ElectricA.C. ElectricFail-Safe Last PositionFail-Safe

(pneumatic tank or spring return)

• Pressure Transducer• Control Box

Additional Options

• Remote Panel• Weatherproof Control Box• Lockable Switch • Drip Pans/Exhaust Pans• Voltages• DCS Signal Input• Silencers• Heaters

Represented by:

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Erv Brochure